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Ring Nebula (M57 in Lyra)

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#1 jeremy9959

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Posted 27 September 2013 - 09:26 AM

Dear All,

Wanted to share this image of M57 -- 20 30 second subexposures, stacked with Deep Sky Stacker, using a Canon Rebel XSI and the f/6.3 focal reducer through my stock Nexstar 8SE.

I bought the 8SE fully aware that it was considered a very suboptimal platform for photography and planning to stick to visual observing. Nevertheless I take great satisfaction in the images I can obtain. And it takes about 10 minutes to set up the scope on my back deck, even with the camera.

Jeremy

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#2 Peter9

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Posted 27 September 2013 - 12:27 PM

Thats I great effort with the standard 8se Jeremy. I like the wide angle view.

Thanks for Posting.

Regards. Peter.

#3 Eddgie

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Posted 27 September 2013 - 04:42 PM

very suboptimal platform



Not sure where that mindset came from. C8 has been used for imaging for decades.

While it is not the best choice for large modern CCD chips, you can still take great images with them.

Often people new to imaging are steered away from the C8 but not because it is not a good platform.

It just isn't a good platform for learning.

Even there though, a focal reducer will fix much of that.

For smaller chips though, C8 is a find platform.

#4 hopskipson

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Posted 27 September 2013 - 04:50 PM

very suboptimal platform



Not sure where that mindset came from. C8 has been used for imaging for decades.

While it is not the best choice for large modern CCD chips, you can still take great images with them.

Often people new to imaging are steered away from the C8 but not because it is not a good platform.

It just isn't a good platform for learning.

Even there though, a focal reducer will fix much of that.

For smaller chips though, C8 is a find platform.


I think he is referring to the Nexstar Mount, not the OTA.

#5 hopskipson

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Posted 27 September 2013 - 04:51 PM

Oh, and that's a crackin' M57 Jeremy :waytogo: :waytogo:!

#6 Eddgie

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Posted 27 September 2013 - 09:49 PM

Ah, forgive my misunderstanding.

#7 Greyhaven

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Posted 28 September 2013 - 08:32 AM

Jeremy
I do all my imaging of DSOs with my 5i and find that it preforms very well when stacking = to or < 30 sec subs even with the OEM mount even without using the wedge. It is nice of you to share it with us.
Be Well
Grey

#8 munchmeister

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Posted 29 September 2013 - 01:00 PM

Dear All,

Wanted to share this image of M57 -- 20 30 second subexposures, stacked with Deep Sky Stacker, using a Canon Rebel XSI and the f/6.3 focal reducer through my stock Nexstar 8SE.

I bought the 8SE fully aware that it was considered a very suboptimal platform for photography and planning to stick to visual observing. Nevertheless I take great satisfaction in the images I can obtain. And it takes about 10 minutes to set up the scope on my back deck, even with the camera.

Jeremy

Fantastic image. Are you using the "stock" 8SE mount, the Alt Az mount??

#9 CelestronDaddy

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Posted 29 September 2013 - 03:42 PM

Jeremy - That is a nice shot of M57 :waytogo:

#10 jeremy9959

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Posted 30 September 2013 - 10:43 AM

Yes, this is the stock one-arm mount.

Jeremy

#11 Schaden

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Posted 30 September 2013 - 03:33 PM

That's an impressive picture you have.
So that was taken with a Canon Rebel and a focal reducer ?

Does the camera mount directly to the OTA or does it attach to the diagonal ?

Very inspiring. I'd like to try AP some time.

#12 jeremy9959

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Posted 30 September 2013 - 05:11 PM

Yes, a Canon XSI with a T-adapter through the 2" visual back and then the f/6.3 focal reducer.
The camera was controlled with Backyard EOS software and
about 20 x 30 second exposures were stacked with "Deep Space Stacker."
A tiny amount of stretching using photoshop was needed but not much.

I was impressed by how clearly the green-blue color comes through.

Good luck. The real pros with fancy mounts can do much more impressive things but I still find this extremely cool.

Jeremy

#13 munchmeister

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Posted 01 October 2013 - 10:41 AM

but I still find this extremely cool.

Jeremy


I agree. Thanks for sharing this info.

#14 ben2112

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Posted 01 October 2013 - 03:47 PM

Very nice image. Thanks for sharing. :)

#15 Whuppy

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Posted 02 October 2013 - 04:40 PM

Great shot Jeremy, very vivid color. Not trying to up your photo, I like the fact the stars are still quite round and it's deep black. I've been seeing a lot of noise in my photo's. Here's a shot I took of the Ring Nebula last weekend. You can even see the central star. It's through a GPS 11 w/stock mount. I used a Nikon D3100 attached to the back, no focal reducer and no processing of any kind. One exposure at 20 seconds. Just dipping my toes into AP and feeling the water. Still a long way to go and a lot to learn. My wife bought me the camera last Christmas and I told her...well honey, now I need a telescope to attach it to! The pic looked much brighter before I resized it...

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#16 sonny.barile

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Posted 02 October 2013 - 05:29 PM

Am I missing something? or is the ring invisible in this pic?

#17 Uggbits

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Posted 02 October 2013 - 07:25 PM

Jeremy: nice capture. When I started out imaging I took about 20-30 seconds of exposures on the Ring with my CPC 800 in alt/az (very similar to the setup you used).

You have a nice image in its own right, however, I took a look at the histogram and it looks like the black point was clipped a little. This means that some data from the image was potentially clipped out during the adjustment of the background to 'black.'

Whuppy, did you stretch your image? It looks a little like a frame that is still raw and unprocessed. Even large data sets (>3-4 hours) will appear mainly black after stacking until they have been stretched. The main benefit gained from increasing both sub exposure and total exposure length is the ability to stretch images farther before they break down due to the increase in the signal to noise ratio.

Anyway back on topic. Fantastic start gentlemen. It's always nice to see others starting more-or-less where I did, and I completely agree with how rewarding the process can be.

Cheers,

Dan

#18 Whuppy

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Posted 02 October 2013 - 08:38 PM

It's there, just a little low to the right. Like I said, it was much brighter before I re-sized it to upload. In the original pic you can even see the star in the center of the ring.

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#19 Whuppy

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Posted 02 October 2013 - 08:49 PM

I did absolutely nothing to the photo. That's straight from my camera. I wasn't able to get enough good photo's to stack and I'm still learning to use the telescope, camera and software.

I wasn't looking to get any advice on the pic, but thank you very much for asking. This thread is Jeremy's and I don't want to clog it up with my questions and answers. After going from a 4.25" to an 11" telescope, I'm simply amazed by all the things I can see now and kinda giddy! The photo was posted merely because I also had taken a photo of M57 recently and I wanted him to see it. Although apparently it didn't post that well after re-sizing. Hopefully this weekend the weather will cooperate and I can get back out there. I'm really itching to get some shots of Jupiter and Orion's Nebula. If I can get a series of decent shots I'll start a new thread for tips/help on guiding and stacking. Thanks again...

#20 HT417

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Posted 03 October 2013 - 12:46 PM

Jeremy - nice work. No matter what I did last night I always caught some kind of movement in my 5se. Maybe the 5se mount is the issue. Regardless, nice job.

#21 jeremy9959

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Posted 03 October 2013 - 05:24 PM

Dear Dan,

Thanks, I'll take a look at the larger TIF file and see if I can tinker with the black point. I am still feeling my way with the post-processing and I appreciate the feedback.

Jeremy

#22 jeremy9959

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Posted 03 October 2013 - 05:25 PM

Dear Whuppy,

I would love to catch the central star in the ring (visually) but so far I haven't managed it. Please don't start making me want an 11" scope!

Jeremy

#23 Tel

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Posted 04 October 2013 - 04:08 AM

Hi Jeremy,

Congratulations on a very nice capture of M57 which, since it's not over exposed, lends itself well to further processing. :bow::bow:

The subject is of course, very small, (as planetary nebulae tend to be), so it might have been better not to have used the f/6.3 reducer and thus the central star would have been much easier to see. Nevertheless, a little further processing, (below), appears to (just about) reveal it.

Best regards,
Tel

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#24 jeremy9959

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Posted 04 October 2013 - 06:21 AM

Dear All,

The TIF file of the stacked images is here:
https://docs.google....dit?usp=sharing

If anyone feels like looking at it I can use all the advice I can get on processing.

Jeremy

#25 Tel

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Posted 04 October 2013 - 11:44 AM

Hi Jeremy,

I think before anyone attempts to advise as to how you might enhance your processing, perhaps make us aware of what processing software you have available to you or intend to use. (?)

Armed with such information, this would therefore dictate the appropriate advisory guidance I'm sure you'll willingly receive from our friends and colleagues here.

Best regards,
Tel






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